Sodium Oxide (Na20) can react with hydrochloric acid (HCI) to produce sodium chloride (NaCl) and water (H20) according to the
following equation:
Na2O + 2HCI -> 2NaCl + H20
How many total atoms are present before
the reaction?
2 before and 2 after
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B)
3 before and 3 after
Eliminate
o
5 before and 5 after
7 before and 7 after

i would say b

explanation:

but i think i would need more information than that

a

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.